#include <jni.h>
#include <string>
#include <set>

extern "C" JNIEXPORT jstring JNICALL
Java_com_xuanyuan_protobuf_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}


//集合
void collect(){
    std::set<int> sets;

    sets.size();
    sets.clear();
    sets.begin();


}

